When you save a file with Source Insight and you have
a project open, Source Insight records the file’s modification
time in the project. If you open a project file and the file’s
modification date is newer than the date recorded in the project, then
Source Insight will re-synchronize the file project symbol database
for that file. By automatically synchronizing, Source Insight allows
you or others in your development team to use another text editor or
a source control system and still maintain Source Insight’s project
databases. See also “Synchronize Files”.